Let's say i want 100 addresses and send to each one ETH.
Right now, i am doing this with "next page" on MyEtherWallet but this just can't be the way to do it. I have to make a note like "page 4 address 3".
I mean what if i use 1000 addresses, i keep clicking next page for 1h?
You can simply go to https://iancoleman.io/bip39 , type in your 12 or 24 words, it will print out 20 addresses by default (with their private keys)
If you scroll down you can change the default from 20 to 100 (in the show parameter) , you can also click on CSV and output the list.
The project is open source and once you downloaded the page you can run it offline to generate the addresses.
This is the repo on Github https://github.com/iancoleman/bip39
Works both with trezor and ledger.
Good Luck!
/KX